已x²+2x-y²+6y-8=0,且x+y≠2,求x-y
如果分式3x-6y/x+y=0,那么x,y 应满足 A、x=2y B、x≠-y C、x=2y且x≠-y D、x=2y且y
若x,y为正数,且2*x+8*y-x*y=0,求x+y的最小值
已知实数x, y满足x²+y²-2x+6y+10=0,求y∧-x.
已知x²+y²+13-4x+6y=0,求(2x-y)²-2(2x-y)(x+2y)+(x+
求经过圆x²+y²-2x-2y+1=0,x²+y²-6x-4y+9=0的交点,且
已知x的2次方+2x-y+6y-8=0,且x+y≠2,求x-y的值
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知x,y为实数,且满足2x²-6x+y²=0,求x²+y²+2x的最大值
已知x+y,且x²-2x=7,y²-2y=7求①x+y②2x+xy+y²